/Engine/Source/Runtime/Engine/Classes/Engine/Level.h
static bool GetLevelScriptExternalActorsReferencesFromPackage ( [FName](API\Runtime\Core\UObject\FName) LevelPackage, [TArray](API\Runtime\Core\Containers\TArray)< [FGuid](API\Runtime\Core\Misc\FGuid) > & OutLevelScriptExternalActorsReferences )